🚀 go-pugleaf

>Steve Firth <filter@firthcom.demon.co.uk> wrote:
>
>> Rebecca and Rowland <real-address-in-sig@flurbletigibbet.rhubarb.foobar>
>> wrote:
>> 
>> > What I'd like to know is how to forge a bounce messsage.
>> 
>> Don't bother, use SIMS or AIMS and bounce them all properly.

SIMS 1.6 is incredibly effective at bouncing spam (it even does a verify on
the sender's address), it cut my spam from 15-20 a day down to practically
nothing. Unfortunately for Demon customers it also cuts down drastically on
our normal mail too (as poined out by Chris Bennett) by bouncing any
further mail items Demon's relays send in the same stream as the spam item.

This is a problem limited to Demon and centers around the need for a reset
(RSET) command to be issued by Demon's server when a MAIL FROM command
fails during a transaction involving multiple mail items, as stated in RFC
281. 

Basically Demon doesn't send a RSET when a MAIL FROM fails, instead Demon's
server presents another MAIL FROM which puts the receiving server (SIMS)
out of sequence so SIMS sends an error (500 Unknown Command), to which
Demon's server responds with yet another MAIL FROM and so it continues
until all further mail in that transaction is bounced. Demon say according
to RFC 281 a RSET is not needed - presumably as a MAIL FROM can act as a
RSET, but Stalker say NOT in the case of multiple items in a transaction.

RFC 281 seems to be ambiguous on this so who knows.

_________________________________________________________________________
  Steve Linford                                steve [at] ultradesign.com
  UltraDesign Technology Ltd.                  http://www.ultradesign.com